How to manage woody medicinal materials after being frozen

The fallen leaves after pruning is a self-protection measure for woody medicinal trees to resist frost injury, which can reduce the abnormal loss of water and avoid the death of trees due to too much water loss. Falling leaves after freezing will delay sprouting, so when the branches sprout and can distinguish between dead and dead branches, cut off dead branches, disease and insect branches in time, retain surviving branches and remaining leaves as far as possible, and prune branches that are difficult to distinguish between dead and alive for a while. The amount of trimming should be light, the cut should be smooth, and the large cut should be sterilized with 75% alcohol or 0.1% potassium permanganate and wrapped with film.

The tree potential of fertilized medicinal materials is generally weak, and the root system of frostbitten trees has poor ability to absorb water and fertilizer. therefore, woody medicinal materials should be fertilized after freezing, and attention should be paid to light application, thin application and repeated application in order to promote sturdy new shoots and restore tree potential. Nitrogen, phosphorus, potassium quick-acting fertilizer is the main fertilizer. It is appropriate to spray fertilizer on the leaf surface after the occurrence of new shoots.

Disease and insect freezing is easy to cause branch damage, fallen leaves, leading to bare branches, and it is easy to appear more serious diseases and insect pests in the future, such as resin disease, sunburn split bark disease and so on. Therefore, it is necessary to prevent and cure diseases in time after freezing, Bordeaux liquid and carbendazim can be used to control diseases, and dichlorvos and trichlorfon can be used to control pests.